Remove inorganic anions and strong organic acids contaminants from sample matrices and neutralize highly acidic samples to improve ion chromatography (IC) performance and facilitate trace ion analysis. Performed prior to IC analysis, the Thermo Scientific™ Dionex™ OnGuard™ II A Cartridges are an off-line sample preparation technique that eliminates these matrix interferences using styrene-based, anion-exchange resin in the bicarbonate. Use them singly or in series, or pretreat up to 12 samples in parallel using the optional Dionex OnGuard Sample Prep Station.

从样品基质中去除无机阴离子和强有机污染物，并中和高度酸性样品以改善离子色谱（IC）性能，并促进痕量离子分析。在进行IC分析之前进行的，Thermo Scientific™Dionex™OnGuard™II A墨盒是一种离线样品制备技术，可以使用基于苯乙烯基于苯乙烯的苯乙烯 - 过分交换树脂消除这些基质干扰。单独使用它们或串联使用它们，或使用可选的Dionex OnGuard样品预备站并行预处理12个样品。